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10Gb Network - Ping Works But Data Transfer Doesn't

Linux Kernel, Network, and Services configuration.
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Hatfriend
Posts: 5
Joined: 2021-12-05 22:05

10Gb Network - Ping Works But Data Transfer Doesn't

#1 Post by Hatfriend »

Hey everyone,
I have a Debian server and TrueNAS box connected to a 1Gb router and wanted to add a direct 10Gb connection to improve data transfer speeds between the two. So I purchased two Chelsio T520-CR NICs, connected them with a DAC and assigned IP addresses to my network as follows:

Linux (1Gb) - IP: 192.168.1.108
Linux (10Gb) - IP: 192.168.2.108
TrueNAS (1Gb) - IP: 192.168.1.100
TrueNAS (10Gb) - IP: 192.168.2.100

When testing the 10Gb network, I'm able to issue successful ping commands using the 192.168.2 subnet, but when I try to run iperf, I get no response. See below.

PING:
192.168.1.100 -> 192.168.1.108 Success
192.168.1.100 <- 192.168.1.108 Success
192.168.2.100 -> 192.168.2.108 Success
192.168.2.100 <- 192.168.2.108 Success

IPERF (iperf3 -c IP):
192.168.1.100 -> 192.168.1.108 Success
192.168.1.100 <- 192.168.1.108 Success
192.168.2.100 -> 192.168.2.108 Fail
192.168.2.100 <- 192.168.2.108 Fail

In order to eliminate a hardware issue, I booted the Debian machine with a TrueNAS boot disk (since it has a known good copy of the Chelsio drivers) and I was able to successfully SSH into the TrueNAS machine. So I know all the equipment works.

Now back to Debian, I must have done something wrong but don't really know where to start. Does anyone have suggestions of what I could try to solve this issue? I feel like I've done everything I can.

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